public class Student {
    // 私有属性
    private String id;
    private String name;
    private String gender;
    private int age;

    // 无参构造方法
    public Student() {
    }

    // 带参构造方法（初始化所有属性）
    public Student(String id, String name, String gender, int age) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    // Getter和Setter方法
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    // 显示学生信息的方法
    public void showInfo() {
        System.out.println("学号：" + id);
        System.out.println("姓名：" + name);
        System.out.println("性别：" + gender);
        System.out.println("年龄：" + age);
        System.out.println(); // 空行
    }
}